Blindstitch sewing-machine.



. PATENTED AUG. 6, 1907.

J. E. FEFBL. STITCH SEWING MACHINE.

5 BLIND APPLIOATIOH FILED MAR. 21, 1906.

6 SHEETS-SHEET 1.

PATENTED AUG. 6,1907.

' J. E. FEFBL. BLINDSTITGH SEWING MACHINE.

AIZPLH'JAIIOH FILED MAR. 21, 1908.

5 SHEETS-SHEET 2,

PATENTED AUG. 6, 1907.

' J.E.FEFEL.

BLINDSTITGH SEWING MACHINE.

APPLIOATION FILED MAR. 21, 1906- 5 SHEETSSHEET 3.

PATENTED AUG. 6, 1907.

APPLICATION FILED MAR. 21, 1 906.

5 SHEETS-SHEET 4.

No. 862,458. L'AL'EN'J IHD AUG, 6, 1907.

J. E; FEFEI BLINDSTITCH SEWING MACHINE. APPLICATION FILED MAB-.21, 199s.

5 SHEETS-SHEET 5.

miles em 'rnir JOHN E. FEFEL, O'F PHILADELPHIA, PENNSYLVANIA, ASSIGNO B TO UNITED: STATES, FELLING MACHINE COMPANY, A. CORPORATION F NEW YSItK:

nnrnns'rrren no. seat-e.

To ell whom it. may con-cum:

it known that I, JOHN E. FnssL, a citizen of the United States, residing at 240 South Ninth street, Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented certain new and useful Im provements in Blindstitch Sewing-Machines, fully described and represented in the iollowing specification and the accompanying drawings, forming'a part of the same. i I

The object of' this invention is to furnish a blindstitch sewing-machine having a v needle operated through a ridge upon the fabric, with a spiral looper carrying s looper-thread to loop with the needle-thread. To effect this object, I provide a sewing-machine feedtable with a longitudinal ridge over which the cloth advances longitudinally during the sewing operation,

, with the curved needle operating inn vertical plane obliquely across the ridge, and' h spiral loop er with a very open spiral, having a horizontal axis substantially level with the top of the ridge and arranged at right an gics thereto, the angle of the looper spiral to its own axis being a little greater than the angle of the needle to the same axis, so that the point of the looper may pass the needle at opposite sides when it is moved spirally back and forth across the ridge. Hcrctofore, a looper has been used in conjunction with a curved needie, to perform blind stitching, by setting the axis of the looper nearly vertical, which necessitates a very flat spiral for the loopcr, revolving so close to the needie as to prevent the passage of any thick layers of cloth or fabric between the loopcr and the needle. By setting the axis of my looper horizontally, I am enabled to make the looper with an open spiral of very coarse pitch, so that it arches over the ridge which supports the cloth, and permits cloth of any thickness to be fed along between the top of the needle and the under side of the looper. In such construction, the looper is prcferahly formed with an tye near the base and an eye near the point, and the needle is formed with an eye opening upon the side; and the spiral looper is not only rotated, but advanced to inovc in a spiral path which first engages the point of the loopcr with a loop of the needle-thread on one side of the needle at the nearer side oi the ridge while the needle is in the cloth, and then carries the point of the loopcr forward across the path of the needle upon the opposite sideof the ridge,

\ so that the needle when taking a. fresh stitch may pass between the looper and a strand of thelooper-thread stretched from the cloth to the eye in the point of the loopcr. In taking each stitch, the looper engages a loop of the needle-thread during the backward movement of the needle, and the needle engages a loop of the looper-thread in the forward movement of the needle.

The needle is mounted upon an oscillating carrier @peciflcation of Letters Fatent. Applioetioufiled amt 21,1905. Serial sm'so'tisr.

e-nso Patented. Aug; 6, 1907.

the side, s; spiral groove upon the needle ia nee i to carry the thread to the outer side'ot the needle; where itmay receive the thread'from asuitable guide' upon the carrier. The eye nan the base of theu looper is extended irom thejnne'r to the outer side of the spiral, and sgioove is extended along the outer side of the spiralirom such eye to the eye upon the point.

A double eye is preferably employed-in the point of the looper, with a rounded bridge or partition between such eyes, and the thread maythus be led, from the groove upon the outer side of the looper izdwardly and then outwardly again, which-throws it morenearly in. the path of the needle when the latter is engngihg thelooper-thread. l 2 v The invention will be understood by reference to the annexed drawing, in which Figure 1. is a side elevation of a machin'e provided with the improvements, Figk2 is a plan of the some? Fig. 3 is a plan of the stitching devices with the parts removed above the shank of the needle; Fig. 3 is a p'lan of the looper, the ridge E, the'needle and its carrier N mt off just above its junctionwith the needle. Fig. 4 is a section ouline 4 4 in Fig. 7; Fig. 5 is a vertical section of the post of the machine in line 55'in Fig. 1, showing the gearing for operating the feed, the needle and the looper; Fig. 6 is a side elevation, and 7 a front elevation of the needle-carrying and looper-carryin'g devices. Fig. 8 is a side elevation of the boiler-- operating devices with the parts, where hatched, inscction at the axis of the looper; Fig. 9 is a cross section on line 9-9 in Fig. 8; Fig. 10 is a cross section on line ]0-10 in Fig. 8; Fig. 1]. is an end view of the loopcrspindle and guide; and Figs. 12, 13, 14 and 15 are diagrains showing different positions of the looper and needle. Fig. 16 is an elevation upon an enlarged scale'of the needle and looper, as shown in Fig. 8; and Fig. 17 is a plan of the needle and looper in the same position. These parts-are enlarged beyond their natural size, to show the eyes and grooves which guide the thread upon the needle and looper.

The frame of the madiinc is shown with post A, gooseneck B, head C, C, and bed D. A seat or ridge E for the cloth to be sewed is extended under the head transverse to the goose-neck, and a foot F, F ,is pressed toward the same at botb sides of the needle a, by a bar G mounted upon the head and provided with spring of.

and the usual lifter I. The seat is sloped upward where the cloth is applied to it, and ridged uniiormlly 7 more acute angle with the ridge E than that formed p y the looper, and a portion of the looper-thread extended tion, with the needle retracted from the cloth as shown inFigs. (land 7. This movement carries the looper spirally across the ridge E and to the opposite side of the needle as shown in Figsfd, 7 and 8, which is due to the fact that the spiral of the Iooper forms a little the needle. This difference in the angles of the looper and the needle, in their relation to the ridge, is clearly shown in Fig. 3.

The needle and looper are shown near their extreme inward position in Figs. 3 and 14, in which theloop'er i s engaging alodp of'the needle-thread. In Fig. 13, the needle is shown partially retracted from the cloth and the loop a": supported upon the looper.

In Fig. 15, the needle is shown drawn almost clear of the cloth, the loop a drawing further back upon from the eye of the looper to'the cloth. In Figs. 6 and ,7, the looper and needle are shown in their ex-' treme outward position just before the needle engages a loop of the looper-thread 2; and in Figs. 8 and 12, thcloopor'is shown partially retracted and the needle somewhat advanced into the loop of the looper-thread.

With the looperin its outer position as shown in Fig. 6 thelooper-thread 2 is stretched from the eye 5 of the loopcr to the cloth 3), and the forward movement of the needle carries it between such thread and the hook of the looper, so that the needle engages a loop of the looper-thread as the looper is retracted. The looper and the needle thus alternately engage loops of the opposite thread, and form a chain-stitch of zigzag appearance as shown in Fig 3, the inclination of the neodle-threads upon the surface of the fabric being due to the inclination of the needle, which is desirable to make it intersect the spiral path of the looper at opposite sides of the same. i

It will be noticed in. Figs. 3 and 7, that the presserfoot is of composite character, as it consists of an arched shoe F which presses upon the fabric before it reaches the path of the needle, and a supplemental finger F which presses upon the cloth after it is sewed, so that it is hold firmly against the ridge E at both sides of the needle-holes. The end of the shoe F is inclined or sloped parallel with the path of the needle, as indicated by the dotted line under the needle-carrier in Fig. 3, which permits the shoe to rest upon the cloth close to the point where it is stitched, and to clear the needle and the spiral end of the looper, when lifted.

(From the above dcscrhpt'ion it will be seen that my particular arrangement of the looper axis permits ,thick layers of cloth to be supported and stitched topassed beneath the. looper without any hindrance,

which cannot be effected if the loope'r axis he vertical or nearly vertical, which necessitates a very flat spiral form for the looper and a movement close to the support and to the path of the needle, so that the point of the looper may engage the needle-thread.

Having thus set forth the nature of the invention what is claimed herein is: I

1. in a sewing machine, the combination, with a spiral looper carrying a looper-thread'and rotated spirally upon a horizontal axis, of a curved needle oscillated in a vertice l plane and traversed'at a slight an rle adross the spiral path of the looper wholly at one sine of the" cloth. whereby the point of the looper is carried than one side of the needle to the other in forming respectively the loops of the necdle-tliread'and loopcr-turead.

2, in a sewing machine, the combination, with a ridge for supporting the cloth, means for feeding the cloth above the surface of the ridge, and a curved needle rcciprocated in a vertical plane transversely to -the ridge wholly at one side of the cloth, of a spiral} looper rotated upon a' horizontal axis and having a spiral movement over the ridge and passing at opposite sides'of the needle upon opposite sides of the ridge.

3. In a sewing machine, the combination, with a ridge for supporting the cloth, and a curved needle reciprocated in a vertical plane diagonally across the ridge wholly at one side of the cloth, of a spiral looper having a horizontal axis transverse to the ridge, and a spiral movement over the ridge with its point moved spirally upon opposite sides of the needle at opposite sides of the ridge.

4. In a sewing machine, the combination, with the ridge supporting the cloth and a needle reciprocated diagonally across the ridge, of a spiral looper having its point moved spirally over the ridge to clear-the same adjacent to opposite sides of the needle, and a yielding. foot sloped at the front corner to clear the needle and the'spiral end oil-the hock when the foot is lifted. v l 1 5. In a sewing machine, the combination, with u horlzontal ridge for supporting the .cloth, of a spiral loopcr having horizontal axis at right angles to the ridge and rotated spirally across the ridge, and having its point carried Iirst upwardly and then downwardly. in crossing the ridge, and the curved needle moved inn vertical plane wholly at one side of the cloth and diagonally across the ridge at opposite sides of the loopers point upon opposite sides of the ridge, and having-an eye opening at the side to form a loop in the path of the looper point as the needle is retracted through the cloth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

' JOHN E. 'FEFEL. Witnesses L. Lnn, THOMAS S. CRANE. 

